An interactive applet and associated web page that provide step-by-step animated instructions on how to
construct an isosceles triangle with given base and altitude
using only a compass and stra...More: lessons, discussions, ratings, reviews,...

Students will discuss the difference between drawing and constructing a triangle using The Geometer’s Sketchpad. They will further develop constructions for both isosceles and equilateral triangles. ...More: lessons, discussions, ratings, reviews,...

Euclid's proposition shows how to construct an isosceles triangle with base angles measuring half of the other angle. The guide then examines the structure of the proposition. The To reset the apple...More: lessons, discussions, ratings, reviews,...

Euclid's proposition deals with the construction of an equilateral triangle. The guide then examines the structure of the proposition. To reset the applet, press "r" while your cursor is over the di...More: lessons, discussions, ratings, reviews,...

Euclid's proposition shows that the angle measure of the two base angles of an isosceles triangle remains the same when the two sides (other than the base) are extended equally. The guide then examin...More: lessons, discussions, ratings, reviews,...

Euclid's proposition shows that when two angles in a triangle are equal, then the sides opposite the angles are equal. The guide then examines the structure of the proposition. To reset the applet, ...More: lessons, discussions, ratings, reviews,...

Geometria is free (GPL) cross-platform software based on a two-role (teacher, student) model. The teacher creates a problem, provides it with an answer and saves the problem in a file. The student ope...More: lessons, discussions, ratings, reviews,...

An interactive applet and associated web page that demonstrate isosceles triangles (two sides the same length).
The applet presents a triangle where the user can drag any vertex.
As the vert...More: lessons, discussions, ratings, reviews,...

In this activity the interactivity attempts to train the user in the classification of triangles with respect to sides and internal angles. The user should move the vertices of a triangle on a square ...More: lessons, discussions, ratings, reviews,...

The user reviews different classifications of triangles by their sides and angles. After viewing examples, users can interactively practice matching different triangles with their correct classificat...More: lessons, discussions, ratings, reviews,...

This activity is available in Word, PDF, or HTML format and at two different levels (an introduction to types of triangles, and a more advanced version). Students use a GSP sketch or interactive web ...More: lessons, discussions, ratings, reviews,...

This JavaSketchpad applet accompanies the tPoW, Types of Triangles. Students are able to drag and manipulate four triangles and by noticing what happens they classify the triangles as either scalene, ...More: lessons, discussions, ratings, reviews,...

This Sketchpad sketch accompanies the tPoW, Types of Triangles. Students are able to drag and manipulate four triangles and by noticing what happens they classify the triangles as either scalene, isos...More: lessons, discussions, ratings, reviews,...

This material is based upon work supported by the
National Science Foundation under Grant DUE-0226284.
Any opinions, findings, and conclusions or recommendations
expressed in this material are those of the author(s)
and do not necessarily reflect the views of the
National Science Foundation.